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D( x )
x = 0
5*x = 0
x = 0
x = 0
5*x = 0
5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:0) U (0:+oo)
2/x = 6/(5*x)+4 // - 6/(5*x)+4
2/x-(6/(5*x))-4 = 0
2/x+(-6/5)*x^-1-4 = 0
4/5*x^-1 = 4 // : 4/5
x^-1 = 5
-1 < 0
1/(x^1) = 5 // * x^1
1 = 5*x^1 // : 5
1/5 = x^1
x = 1/5
x = 1/5
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